Regulus Resources Announces Completion of Mineral Resource Estimate for Integrated Coimolache Sulphide/AntaKori Copper-Gold Project

About this update from Regulus Resources Inc

VANCOUVER, British Columbia, June 30, 2026 (GLOBE NEWSWIRE) -- Regulus Resources Inc. (“Regulus” or the “Company”, TSX-V: REG, OTCQX: RGLSF) is pleased to announce that the Company, in collaboration with Compañía Minera Coimolache S.A. (“Coimolache”, collectively with Regulus the “Parties”) have completed the first phase of the collaboration agreement previously announced on July 25, 2024. The agreement was designed to evaluate the viability of an integrated Coimolache Sulphides/AntaKori copper-gold project (“Integrated Sulphide Project”), starting with the completion of a mineral resource estimate (“MRE”), with the option, upon mutual agreement of the Parties following the completion of a MRE, to complete a preliminary economic assessment (“PEA”). The results of the MRE and PEA (should the Parties agree to move forward) can only be publicly released upon mutual agreement of the Parties and regulatory approvals. John Black, Chief Executive Officer of Regulus, commented: “The completion of the Integrated Resource Estimate constitutes a milestone for both Regulus and our neighbours. This is the first fully unconstrained resource estimate created by a third-party, removing property boundaries and focusing solely on mineralization. While we don’t anticipate the report being made public, the completion of the study still represents a significant step forward for the region, as it allows all parties to understand the value that can be unlocked in the district via collaboration. While we decide next steps regarding our agreement with Coimolache, we continue to de-risk the project on the ground via advancing our community programs to set the stage for future development.” The MRE was completed by SRK Peru, which has developed an internal report that has been distributed to the Parties. The Company will provide no further updates regarding discussions with Coimolache until decisions are made regarding the MRE and PEA. The Company cannot provide a timeline for a decision at this time. The AntaKori Project The AntaKori project, located in Cajamarca, Peru, currently hosts a resource with indicated mineral resources of 250 million tonnes with a grade of 0.48 % Cu, 0.29 g/t Au, 7.5 g/t Ag, and inferred mineral resources of 267 million tonnes with a grade of 0.41 % Cu, 0.26 g/t Au, 7.8 g/t Ag. The AntaKori project is immediately adjacent to and interfingered with minera...

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